Changes to storage, allows for no labels and generative targets.

[sjohn4]

Here is everything that has to be changed in storage to be able to train without labels or generative targets.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.59%. Comparing base (c961257) to head (fdac930).

Additional details and impacted files

@@                 Coverage Diff                 @@
##           sjohn/gen_modyn     #664      +/-   ##
===================================================
+ Coverage            85.58%   85.59%   +0.01%     
===================================================
  Files                  258      258              
  Lines                11378    11386       +8     
===================================================
+ Hits                  9738     9746       +8     
  Misses                1640     1640              

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[github-actions]

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[sjohn4]

This Pr changes the code for the storage file wrappers to allow datasets to not include labels and to include either nothing or generative targets, which can be saves as bytes like normal samples. Along with tests for these cases.